The backside of the ‘classic’ model. The small bar on the right holds the digits in place after they are slid in. Photo: Amy O’Hair

The backside of the 'classic' model. The small bar on the right holds the digits in place after they are slid in. Photo: Amy O'Hair

The backside of the ‘classic’ model. The small bar on the right holds the digits in place after they are slid in. Photo: Amy O’Hair

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